Building block



FIG. 1 is a perspective view of the building block of the present invention showing the front face having two distinct surfaces;

FIG. 2 is a front plan view of the building block of the present invention;

FIG. 3 is a top plan view of the building block of the present invention;

FIG. 4 is a front, fragmented elevational view of a plurality of building blocks of the present invention shown in alternative positions and stacked together to form a wall.

FIG. 5 is a front plan view further illustrating the building block of FIG. 1 with a score line that delineates the respective surfaces; and,

FIG. 6 is a top plan view of the building block of FIG. 5.

The broken line showing the rear portion of the block as the plurality of blocks shown stacked in alternative positions is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a building block, substantially as shown and described. 